From: Peter Zijlstra <peterz@infradead•org>
To: "Michael S. Tsirkin" <mst@redhat•com>
Cc: "Paul E. McKenney" <paulmck@linux•vnet.ibm.com>,
linux-kernel@vger•kernel.org, mingo@kernel•org,
jiangshanlai@gmail•com, dipankar@in•ibm.com,
akpm@linux-foundation•org, mathieu.desnoyers@efficios•com,
josh@joshtriplett•org, tglx@linutronix•de, rostedt@goodmis•org,
dhowells@redhat•com, edumazet@google•com, fweisbec@gmail•com,
oleg@redhat•com, Jason Wang <jasowang@redhat•com>,
kvm@vger•kernel.org, virtualization@lists•linux-foundation.org,
netdev@vger•kernel.org
Subject: Re: [PATCH tip/core/rcu 21/21] drivers/vhost: Remove now-redundant read_barrier_depends()
Date: Tue, 5 Dec 2017 22:57:00 +0100 [thread overview]
Message-ID: <20171205215700.GV3165@worktop.lehotels.local> (raw)
In-Reply-To: <20171205222857-mutt-send-email-mst@kernel.org>
On Tue, Dec 05, 2017 at 11:24:49PM +0200, Michael S. Tsirkin wrote:
> READ_ONCE is really all over the place (some code literally replaced all
> memory accesses with READ/WRITE ONCE).
Yeah, so? Complain to the compiler people for forcing us into that.
> Would an API like WRITE_POINTER()/smp_store_pointer make sense,
> and READ_POINTER for symmetry?
No, the whole point of the exercise was to get away from the fact that
dependent loads are special.
next prev parent reply other threads:[~2017-12-05 21:57 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20171201195053.GA23494@linux.vnet.ibm.com>
2017-12-01 19:50 ` [PATCH tip/core/rcu 03/21] drivers/net/ethernet/qlogic/qed: Fix __qed_spq_block() ordering Paul E. McKenney
2017-12-01 19:51 ` [PATCH tip/core/rcu 14/21] netfilter: Remove now-redundant smp_read_barrier_depends() Paul E. McKenney
2017-12-01 19:51 ` [PATCH tip/core/rcu 21/21] drivers/vhost: Remove now-redundant read_barrier_depends() Paul E. McKenney
2017-12-05 18:31 ` Michael S. Tsirkin
2017-12-05 18:39 ` Peter Zijlstra
2017-12-05 18:57 ` Michael S. Tsirkin
2017-12-05 19:17 ` Peter Zijlstra
2017-12-05 19:24 ` Michael S. Tsirkin
2017-12-05 19:33 ` Paul E. McKenney
2017-12-05 19:51 ` Michael S. Tsirkin
2017-12-05 19:57 ` Peter Zijlstra
2017-12-05 20:28 ` Michael S. Tsirkin
2017-12-05 21:17 ` Peter Zijlstra
2017-12-05 21:42 ` Michael S. Tsirkin
2017-12-05 20:08 ` Paul E. McKenney
2017-12-05 21:24 ` Michael S. Tsirkin
2017-12-05 21:36 ` Paul E. McKenney
2017-12-05 21:43 ` Michael S. Tsirkin
2017-12-05 22:02 ` Paul E. McKenney
2017-12-05 22:09 ` Peter Zijlstra
2017-12-05 21:57 ` Peter Zijlstra [this message]
2017-12-05 22:09 ` Michael S. Tsirkin
2017-12-05 23:39 ` Paul E. McKenney
2017-12-05 19:55 ` Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171205215700.GV3165@worktop.lehotels.local \
--to=peterz@infradead$(echo .)org \
--cc=akpm@linux-foundation$(echo .)org \
--cc=dhowells@redhat$(echo .)com \
--cc=dipankar@in$(echo .)ibm.com \
--cc=edumazet@google$(echo .)com \
--cc=fweisbec@gmail$(echo .)com \
--cc=jasowang@redhat$(echo .)com \
--cc=jiangshanlai@gmail$(echo .)com \
--cc=josh@joshtriplett$(echo .)org \
--cc=kvm@vger$(echo .)kernel.org \
--cc=linux-kernel@vger$(echo .)kernel.org \
--cc=mathieu.desnoyers@efficios$(echo .)com \
--cc=mingo@kernel$(echo .)org \
--cc=mst@redhat$(echo .)com \
--cc=netdev@vger$(echo .)kernel.org \
--cc=oleg@redhat$(echo .)com \
--cc=paulmck@linux$(echo .)vnet.ibm.com \
--cc=rostedt@goodmis$(echo .)org \
--cc=tglx@linutronix$(echo .)de \
--cc=virtualization@lists$(echo .)linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox